U.S. patent application number 15/004452 was filed with the patent office on 2016-12-15 for antenna structure.
The applicant listed for this patent is ARCADYAN TECHNOLOGY CORPORATION. Invention is credited to Chih-Yung Huang.
Application Number | 20160365639 15/004452 |
Document ID | / |
Family ID | 55910882 |
Filed Date | 2016-12-15 |
United States Patent
Application |
20160365639 |
Kind Code |
A1 |
Huang; Chih-Yung |
December 15, 2016 |
ANTENNA STRUCTURE
Abstract
An antenna structure is disclosed. The antenna structure
includes a reference axis having a first direction; a
signal-feeding terminal; and a radiating portion, including a first
conductor extending from the signal-feeding terminal along the
first direction to a first turning point; a second conductor
extending from the first turning point across the longitudinal
reference axis to a second turning point; a third conductor
extending from the second turning point along the first direction
to a third turning point; a fourth conductor extending from the
third turning point across the reference axis to a fourth turning
point; and a fifth conductor extending from the fourth turning
point along a second direction opposite to the first direction.
Inventors: |
Huang; Chih-Yung; (Hsinchu,
TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
ARCADYAN TECHNOLOGY CORPORATION |
Hsinchu |
|
TW |
|
|
Family ID: |
55910882 |
Appl. No.: |
15/004452 |
Filed: |
January 22, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H01Q 1/48 20130101; H01Q
1/38 20130101; H01Q 1/52 20130101; H01Q 9/42 20130101; H01Q 9/18
20130101; H01Q 5/371 20150115; H01Q 1/36 20130101; H01Q 9/285
20130101; H01Q 9/145 20130101; H01Q 9/38 20130101 |
International
Class: |
H01Q 9/18 20060101
H01Q009/18; H01Q 9/14 20060101 H01Q009/14; H01Q 1/52 20060101
H01Q001/52 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 12, 2015 |
TW |
104119185 |
Claims
1. An antenna structure, comprising: a first reference axis having
a longitudinal direction, a first side with respect to the first
reference axis, and a second side opposite to the first side; a
signal-feeding terminal; a radiating portion, including: a first
conductor configured at the first side, and extending from the
signal-feeding terminal along the longitudinal direction to a first
turning point; a second conductor extending from the first turning
point across the first reference axis to a second turning point at
the second side; a third conductor configured at the second side,
and extending from the second turning point along the longitudinal
direction to a third turning point; a fourth conductor extending
from the third turning point across the first reference axis to a
fourth turning point at the first side; and a fifth conductor
configured at the first side, and extending from the fourth turning
point along a first direction opposite to the longitudinal
direction; a ground terminal configured to he separated from the
signal-feeding terminal with a first gap; and a ground portion
including a first ground conductor extending from the ground
terminal.
2. The antenna structure as claimed in claim 1, wherein the
radiating portion further includes a sixth conductor extending from
the third conductor across the first reference axis to the first
side, and the fifth conductor extends to a fifth turning point
between the sixth conductor and the fourth turning point.
3. The antenna structure as claimed in claim 2, wherein the
radiating portion further includes a seventh conductor extending
from the fifth turning point toward the third conductor.
4. The antenna structure as claimed in claim 3, further comprising:
a substrate disposing thereon the signal-feeding terminal, the
radiating portion, the ground terminal and the ground portion; the
first gap; a second gap disposed between the first conductor and
the first ground conductor, and connected to the first gap; a third
gap disposed between the second conductor and the first ground
conductor.sub.; and connected to the second gap; a fourth gap
disposed between the sixth conductor and the second conductor; and
a fifth gap disposed among the third conductor, the fourth
conductor, the fifth conductor, the sixth conductor and the seventh
conductor.
5. The antenna structure as claimed in claim 4, wherein the
radiating portion has a length for determining an operating
frequency of the antenna structure.
6. The antenna structure as claimed in claim 5, wherein the fourth
gap is provided for adjusting an impedance of the antenna
structure, and has a size depending on the length of the radiating
portion.
7. The antenna structure as claimed in claim 4, wherein the second
gap has a first size depending on a second size of the radiating
portion.
8. The antenna structure as claimed in claim 7, wherein the ground
portion has a third size depending on the second size.
9. The antenna structure as claimed in claim 1, wherein the ground
portion further includes a second ground conductor extending from
the ground terminal along the first direction.
10. The antenna structure as claimed in claim 10, wherein the
second ground conductor includes a first portion located at the
first side, and a second portion located at the second side.
11. The antenna structure as claimed in claim 1, wherein the ground
portion. is electrically insulated from the radiating portion.
12. The antenna structure as claimed in claim 1, wherein the second
conductor is perpendicular to the first conductor.
13. The antenna structure as claimed in claim 1, wherein the third
conductor is perpendicular to the second conductor, and parallel to
the first conductor.
14. The antenna structure as claimed in claim 1, wherein the fifth
conductor is parallel to the third conductor.
15. The antenna structure as claimed in claim 1, wherein the sixth
conductor is perpendicular to the fifth conductor, and parallel to
the second conductor.
16. An antenna structure, comprising: a reference axis having a
first direction; a signal-feeding terminal; a radiating portion,
including: a first conductor extending from the signal-feeding
terminal along the first direction to a first turning point; a
second conductor extending from the first turning point across the
reference axis to a second turning point; a third conductor
extending from the second turning point along the first direction
to a third turning point; a fourth conductor extending from the
third turning point across the reference axis to a fourth turning
point; and a fifth conductor extending from the fourth turning
point along a second direction opposite to the first direction; and
a ground terminal configured to be separated from the
signal-feeding terminal with a first gap.
17. The antenna structure as claimed in claim 16, further
comprising: a first side with respect to the reference axis; and a
second side opposite to the first side.
18. The antenna structure as claimed in claim 17, wherein the
radiating portion further includes a sixth conductor extending from
the third conductor across the reference axis to the first side,
and the fifth conductor extends to a fifth turning point between
the sixth conductor and the fourth turning point.
19. The antenna structure as claimed in claim 16, further
comprising a ground portion including a first ground conductor
extending from the ground terminal.
20. An antenna structure, comprising: a longitudinal reference axis
having a first direction; a signal-feeding terminal; and a
radiating portion, including: a first conductor extending from the
signal-feeding terminal along the first direction to a first
turning point; a second conductor extending from the first turning
point across the longitudinal reference axis to a second turning
point; a third conductor extending from the second turning point
along the first direction to a third turning point; a fourth
conductor extending from the third turning point across the
reference axis to a fourth turning point; and a fifth conductor
extending from the fourth turning point along a second direction
opposite to the first direction.
Description
CROSS-REFERENCE TO RELATED APPLICATION AND CLAIM OF PRIORITY
[0001] The application claims the benefit of the Taiwan Patent
Application No. 104119185 filed on Jun. 12, 2015 at the Taiwan
Intellectual Property Office, the disclosures of which are
incorporated herein in their entirety by reference.
FIELD OF THE INVENTION
[0002] The present invention relates to an antenna structure, and
more particularly to a printed dipole antenna structure.
BACKGROUND OF THE INVENTION
[0003] Nowadays, various compact antennas have been developed and
applied to various compact hand-held electronic devices (e.g.
cellphones or notebook computers) or wireless transmission devices
(e.g. access points (AP)). For example, the planar inverse-F
antenna (PIFA) which is compact, has good transmission efficiency,
and can be easily disposed on the inner wall of a hand-held
electronic device, already exists, and is widely applied in various
hand-held electronic devices, notebook computers or wireless
communication devices for wireless communication.
[0004] In a conventional Lite antenna where the signal is fed from
the center of the antenna, the length of the cable is longer, and
the resonance is generated in the way of ground terminal coupling.
This results in the disadvantages of lower efficiency, difficult
welding and assembly, two-sided production and a high production
cost.
[0005] In order to overcome the drawbacks in the prior art, an
antenna structure is disclosed. The particular design in the
present invention not only solves the problems described above, but
also is easy to implement. Thus, the present invention has utility
for the industry.
SUMMARY OF THE INVENTION
[0006] The present invention discloses a printed dipole antenna for
a wireless transmission device. The printed dipole antenna in the
present invention is suitable for an antenna disposed outside the
wireless transmission device. In addition, the antenna structure of
the present invention is an atypical design; that is, the signal is
not fed from the center of the antenna.
[0007] In accordance with one aspect of the present invention, an
antenna structure is disclosed. The antenna structure includes a
first reference axis having a longitudinal direction, a first side
with respect to the first reference axis, and a second side
opposite to the first side; a signal-feeding terminal; a radiating
portion, including a first conductor configured at the first side,
and extending from the signal-feeding terminal along the
longitudinal direction to a first turning point; a second conductor
extending from the first turning point across the first reference
axis to a second turning point at the second side; a third
conductor configured at the second side, and extending from the
second turning point along the longitudinal direction to a third
turning point; a fourth conductor extending from the third turning
point across the first reference axis to a fourth turning point at
the first side; and a fifth conductor configured at the first side,
and extending from the fourth turning point along a first direction
opposite to the longitudinal direction; a ground terminal
configured to be separated from the signal-feeding terminal with a
first gap; and a ground portion including a first ground conductor
extending from the ground terminal.
[0008] In accordance with the above aspect, the radiating portion
further includes a sixth conductor extending from the third
conductor across the first reference axis to the first side, and
the fifth conductor extends to a fifth turning point between the
sixth conductor and the fourth turning point.
[0009] In accordance with the above aspect, the radiating portion
further includes a seventh conductor extending from the fifth
turning point toward the third conductor.
[0010] In accordance with the above aspect, the antenna structure
further includes a substrate disposing thereon the signal-feeding
terminal, the radiating portion, the ground terminal and the ground
portion; the first gap; a second gap disposed between the first
conductor and the first ground conductor, and connected to the
first gap; a third gap disposed between the second conductor and
the first ground conductor, and connected to the second gap; a
fourth gap disposed between the sixth conductor and the second
conductor; and a fifth gap disposed among the third conductor, the
fourth conductor, the fifth conductor, the sixth conductor and the
seventh conductor.
[0011] In accordance with the above aspect, the radiating portion
has a length for determining an operating frequency of the antenna
structure.
[0012] In accordance with the above aspect, the fourth gap is
provided for adjusting an impedance of the antenna structure, and
has a size depending on the length of the radiating portion.
[0013] In accordance with the above aspect, the second gap has a
first: size depending on a second size of the radiating
portion.
[0014] In accordance with the above aspect, the ground portion has
a third size depending on the second size.
[0015] In accordance with the above aspect, the ground portion
further includes a second ground conductor extending from the
ground terminal along the first direction.
[0016] In accordance with the above aspect, the ground portion
further includes a first portion located at the first side, and a
second portion located at the second side.
[0017] In accordance with the above aspect, the ground portion is
electrically insulated from the radiating portion.
[0018] In accordance with the above aspect, the second conductor is
perpendicular to the first conductor.
[0019] In accordance with the above aspect, the third conductor is
perpendicular to the second conductor, and parallel to the first
conductor.
[0020] In accordance with the above aspect, the fifth conductor is
parallel to the third conductor.
[0021] In accordance with the above aspect, the six conductor is
perpendicular to the fifth conductor, and parallel to the second
conductor.
[0022] In accordance with another aspect of the present invention,
an antenna structure is disclosed. The antenna structure includes a
reference axis having a first direction; a signal-feeding terminal;
a radiating portion, including a first conductor extending from the
signal-feeding terminal along the first direction to a first
turning point; a second conductor extending from the first turning
point across the reference axis to a second turning point; a third
conductor extending from the second turning point along the first
direction to a third turning point; a fourth conductor extending
from the third turning point across the reference axis to a fourth
turning point; and a fifth conductor extending from the fourth
turning point along a second direction. opposite to the first
direction; and a ground terminal configured to be separated from
the signal-feeding terminal with a first gap.
[0023] In accordance with the above aspect, the antenna structure
further includes a first side with respect to the reference axis;
and a second side opposite to the first side.
[0024] In accordance with the above aspect, the radiating portion
further includes a sixth conductor extending from the third
conductor across the reference axis to the first side, and the
fifth conductor extends to a fifth turning point between the sixth
conductor and the fourth turning point.
[0025] In accordance with the above aspect, the antenna structure
further includes a ground portion including a first ground
conductor extending from the ground terminal.
[0026] In accordance with a further aspect of the present
invention, an antenna structure is disclosed. The antenna structure
includes a reference axis having a first direction; a
signal-feeding terminal; and a radiating portion, including a first
conductor extending from the signal-feeding terminal along the
first direction to a first turning point; a second conductor
extending from the first turning point across the longitudinal
reference axis to a second turning point; a third conductor
extending from the second turning point along the first direction
to a third turning point; a fourth conductor extending from the
third turning point across the reference axis to a fourth turning
point; and a fifth conductor extending from the fourth turning
point along a second direction opposite to the first direction.
[0027] The above objectives and advantages of the present invention
will become more readily apparent to those ordinarily skilled in
the art after reviewing the following detailed descriptions and
accompanying drawings, in which:
BRIEF DESCRIPTION OF THE DRAWINGS
[0028] FIG. 1(a) is a front view of an antenna structure according
to one embodiment of the present invention;
[0029] FIG. 1(b) is a side view of the antenna structure in FIG.
1(a);
[0030] FIGS. 2(a)-2(c) are front views of an antenna according to
one embodiment of the present invention;
[0031] FIG. 3 shows the relationship between the frequency and the
return loss of the antenna structure according to one embodiment of
the present invention; and
[0032] FIG. 4 shows the relationship between the frequency and the
efficiency of the antenna structure according to one embodiment of
the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0033] The present invention will now be described more
specifically with reference to the following embodiments. It is to
be noted that the following descriptions of the preferred
embodiments of this invention are presented herein for the purposes
of illustration and description only; they are not intended to be
exhaustive or to be limited to the precise form disclosed.
[0034] The objective of the present invention is to provide an
antenna structure, which can be operated alone on an external
system without additional ground areas, is suitable for the
electronic device of the wireless transmission device, and can be
easily adjusted and modified according to the product design to
achieve the appropriate application. The embodiments of the present
invention can all be applied to the operating bands of LTE-Band 13
(746.about.787 MHz), LTE-Band 17 (704.about.746 MHz), LTE-Band 20
(791.about.862 MHz), LTE-Band 5 (824.about.894 MHz) and 3G-Band
(860.about.960 MHz). That is, the embodiments of the present
invention can be applied to the operating bands of 698-960 MHz, or
the band of the present invention can be slightly adjusted to be
applied to the antenna of wireless communication devices with other
operating bands other than the above-mentioned bands, in addition,
the antenna structure of the present invention has an antenna
efficiency of 59-60% in the operating bands of 698-960 MHz, which
is quite superior antenna efficiency for a low-frequency
antenna.
[0035] The present invention is a printed dipole antenna structure
disposed on a substrate (e.g. a printed circuit board, PCB),
wherein the antenna structure is formed by printing a microstrip
line on one side of the substrate, and connecting the
signal-feeding terminal and the ground terminal to the microstrip
line. The position of the other side of the substrate corresponding
to the microstrip line has no ground metal printed thereon. The
substrate can be a multilayer substrate or a single-layer substrate
without metal,
[0036] Please refer to FIGS. 1(a) and 1(b). FIG. 1(a) is a front
view of an antenna 100 structure according to one embodiment of the
present invention, and FIG. 1(b) is a side view of the antenna
structure in FIG. 1(a). As shown in FIGS. 1(a) and 1(b), the
antenna structure 100 includes a radiating portion 101, a grounding
portion 102, a signal-feeding terminal 103, a ground terminal 104,
a fourth gap G14 and a substrate 107. The antenna structure 100
further includes a first reference axis A, a first side with
respect to the first reference axis A, and a second side opposite
to the first side, wherein the first reference axis A has a
longitudinal direction d1.
[0037] The radiating portion 101 includes a plurality of extending
portions. The extending portions have a first conductor a1, a
second conductor b1, a third conductor c1, a fourth conductor d1
and a fifth conductor e1. The first conductor a1 is configured at
the first side, and extends from the signal-feeding terminal 103
along the longitudinal direction d1 to a first turning point TP1.
The second conductor b1 extends from the first turning point TP1
across the first reference axis A to a second turning point TP2 at
the second side. The third conductor c1 is configured at the second
side, and extends from the second turning point TP2 along the
longitudinal direction d1 to a third turning point TP3. The fourth
conductor d1 extends from the third turning point TP3 across the
first reference axis A to a fourth turning point TP4 at the first
side. The fifth conductor e1 is configured at the first side, and
extends from the fourth turning point TP4 along a first direction
opposite to the longitudinal direction d1.
[0038] The second conductor b1 is perpendicular to the first
conductor a1. The third conductor c1 is perpendicular to the second
conductor b1, and parallel to the first conductor a1. The fifth
conductor e1 is parallel to the third conductor c1.
[0039] The radiating portion 101 further includes a sixth conductor
105. The sixth conductor 105 extends from the third conductor c1
across the first reference axis A to the first side, and the fourth
gap G14 is disposed between the sixth conductor 105 and the second
conductor b1. The fifth conductor e1 extends to a fifth turning
point TP5 between the sixth conductor 105 and the fourth turning
point TP4.
[0040] The ground terminal 104 is configured to be separated from
the signal-feeding terminal 103 with a first gap G11. The ground
portion 102 further includes a first ground conductor G extending
from the ground terminal 104.
[0041] In addition to the first gap G11 between the first conductor
a1 and the first ground conductor G, the antenna structure 100
further includes a second gap G12, a third gap G13 and a fifth gap
G15. The second gap G12 is disposed between the first conductor al
and the first ground conductor G, and connected to the first gap
G11. The third gap G13 is disposed between the second conductor b1
and the first ground conductor G, and connected to the second gap
G12. The fifth gap G15 is disposed among the sixth conductor 105,
the third conductor c1, the fourth conductor d1 and the fifth
conductor e1.
[0042] The radiating portion 101 further includes an extending
portion. (not shown). The extending portion has a seventh conductor
(not shown) extending from the fifth turning point TP5 toward the
third conductor c1. In addition, the seventh conductor is
perpendicular to the fifth conductor e1, and parallel to the second
conductor b1.
[0043] The ground portion 102 further includes a second ground
conductor (not shown) extending from the ground terminal 104 along
the first direction. The second ground conductor includes a first
portion located at the first side, and a second portion located at
the second side.
[0044] The length of the radiating portion 101 determines the
operating frequency of the antenna structure 100. The fourth gap
G14 is provided for adjusting the impedance of the antenna
structure 100 so that the voltage standing wave ratio (VAWR) of the
antenna structure 100 can reach the standard and requirements of
the industry. In addition, the size of the fourth gap G14 depends
on the length of the radiating portion 101. The size of the second
gap G2 depends on the size of the radiating portion 101. The size
of the ground portion 102 also depends on the size of the radiating
portion 101.
[0045] Please refer to FIGS. 2(a), 2(b) and 2(c), which are front
views of an antenna 200 structure according to one embodiment of
the present invention. As shown in FIGS. 2(a), 2(b) and 2(c), the
antenna structure 200 includes a radiating portion 201, a grounding
portion 202, a signal-feeding terminal 203, a ground terminal 204,
a fourth gap G24 and a substrate 207. The antenna structure 200
further includes a first reference axis A, a first side with
respect to the first reference axis A, and a second side opposite
to the first side, wherein the first reference axis A has a
longitudinal direction d1. The ground terminal 204 is configured to
be separated from the signal-feeding terminal 203 with a first gap
G21.
[0046] The radiating portion 201 includes a plurality of extending
portions. The extending portions have a first conductor a2, a
second conductor b2, a third conductor c2, a fourth conductor d2
and a fifth conductor e2. The first conductor a2 is configured at
the first side, and extends from the signal-feeding terminal 203
along the longitudinal direction d1 to a first turning point TP1.
The second conductor b2 extends from the first turning point TP1
across the first reference axis A to a second turning point TP2 at
the second side. The third conductor c2 is configured at the second
side, and extends from the second turning point TP2 along the
longitudinal direction d1 to a third turning point TP3. The fourth
conductor d2 extends from the third turning point TP3 across the
first reference axis A to a fourth turning point TP4 at the first
side. The fifth conductor e2 is configured at the first side, and
extends from the fourth turning point TP4 along a first direction
opposite to the longitudinal direction d1.
[0047] The radiating portion 201 further includes a sixth conductor
205. The sixth conductor 205 extends from the third conductor c2
across the first reference axis A to the first side, wherein the
fifth conductor e2 extends to a fifth turning point TP5 between the
sixth conductor 205 and the fourth turning point TP4.
[0048] The radiating portion 201 further includes an extending
portion 2011 having a seventh conductor f. The seventh conductor f
extends from the fifth turning point TP5 toward the third conductor
c2, is perpendicular to the fifth conductor e2, and is parallel to
the second conductor b2. The extending portion is designed to
increase the length of the radiating portion 201 to generate the
operating frequency to be used, without increasing the overall
size.
[0049] The radiating portion 201, the extending portion 2011, the
ground portion 202, the signal-feeding terminal 203, the ground
terminal 204 and the sixth conductor 205 are coplanar.
[0050] The ground portion 202 includes a first ground conductor 208
and a second ground conductor c'. The first ground conductor 208
extends from the ground terminal 204. The second ground conductor
c' also extends from the ground terminal 204, and includes a first
portion located at the first side and a second portion located at
the second side.
[0051] The first ground conductor 208 has a first conductor branch
a' and a second conductor branch b'. The first conductor branch a
is parallel to the second conductor b2, and the second conductor
branch b' is parallel to the first conductor a2. There is a right
angle between the first conductor branch a' and the second
conductor branch b'. The two sides of the first conductor branch a'
are connected to the second conductor branch b' and the ground
conductor c'.
[0052] The sizes of the radiating portion 201 and the ground
portion 202 can vary with the case of the product designed, as the
areas A1, A2, A3 in FIG. 2(a) show. The widths of the first
conductor a2, the third conductor c2, the fourth conductor d2 and
the fifth conductor e2 can be adjusted to fine-tune the efficiency
and the return loss of the antenna structure 200. In addition, the
area A1 does not significantly affect the impedance matching of the
antenna structure 200, but the size of the fourth gap G24
significantly affects the impedance matching of the antenna
structure 200.
[0053] As shown in FIG. 2(b), the design of the radiating portion
201 and the ground portion 202 causes the current paths (as the
arrows show) of the first conductor a2 and the second conductor
branch b' to have an identical direction and be parallel to each
other. This results in the coupling reaction of the current,
thereby causing the antenna structure 200 to have efficiency that
is up to 60% and stable in the frequency band of 698.about.960
MHz.
[0054] As shown in FIGS. 2(a) and 2(b), in addition to the first
gap G21 disposed between the first conductor a2 and the first
ground conductor 208, the antenna structure 200 further includes a
second gap G22, a third gap G23 and a fifth gap G25. The second gap
G22 is disposed between the first conductor a2 and the first ground
conductor 208, and connected to the first gap G21. The third gap
G23 is disposed between the second conductor b2 and the first
ground conductor 208, and is connected to the second gap G22. The
fifth gap G25 is disposed among the sixth conductor 205, the third
conductor c2, the fourth conductor d2, the fifth conductor e2 and
the seventh conductor f.
[0055] According to one embodiment of the present invention, the
total length of the first conductor a2, the second conductor b2,
the third conductor c2, the fourth conductor d2, the fifth
conductor e2 and the extending portion 2011 is greater than that of
the first ground conductor 208 and the second ground conductor c'.
The total length of the first conductor a2, the second conductor
b2, the third conductor c2, the fourth conductor d2, the fifth
conductor e2 and the extending portion 2011 is about 2 times the
total length of the first ground conductor 208 and the second
ground conductor c'.
[0056] As shown in FIG. 2(c), the first conductor a2 has a first
distance D1, a second distance D2 and a third distance D3. The
second conductor b2 has a fourth distance D4. The third conductor
c2 has a fifth distance D5, a sixth distance D6 and a seventh
distance D7. The fourth conductor d4 has an eighth distance D8. The
fifth conductor e2 has a ninth distance D9 and a tenth distance
D10. The extending portion 2011 has an eleventh distance D11. The
sixth conductor 205 has a twelfth distance D12, a thirteenth
distance D13 and a fourteenth distance D14.
[0057] The first distance D1 is greater than the second distance
D2. The second distance D2 is greater than the third distance D3.
The third distance D3 is less than half of the first distance D1.
The first distance D1 is less than half of the fourth distance D4.
The third distance D3 is approximately equal to the fifth distance
D5. The sixth distance D6 is greater than the seventh distance D7.
The eighth distance D8 is approximately equal to the fifth distance
D5. The ninth distance D9 is approximately equal to the seventh
distance D7. The tenth distance D10 is approximately equal to the
sixth distance D6. The eleventh distance D11 is less than the first
distance D1 but greater than the second distance D2. The twelfth
distance D12 is approximately equal to the fourth distance D4. The
thirteenth distance D13 is less than the twelfth distance D12. The
fourteenth distance D14 is approximately equal to one-third of the
fourth distance D4. The sum of the second distance D2 and the
fourth distance D4 is equal to a total width, and the sum of the
sixth distance D6 and the twelfth distance is also equal to the
total width.
[0058] The second conductor branch b' has a fifteenth distance S1
and a sixteenth distance S2. The first conductor branch at has a
seventeenth distance S3. The second ground conductor c' has a
eighteenth distance S4 and a nineteenth distance S5.
[0059] The fifteenth distance S1 is less than the sixteenth
distance S2. The fifteenth distance S1 is less than half of the
seventeenth distance S3. The eighteenth distance S4 is less than
the seventeenth distance S3 but slightly larger than the nineteenth
distance S5. The seventeenth distance 53 is approximately equal to
the thirteenth distance D13.
[0060] The second gap G22 has a twentieth distance L1 and a
twenty-first distance L2. The third gap G23 has a twenty-second
distance L3. The fourth gap G24 has a twenty-third distance L4, a
twenty-fourth distance L5 and a twenty-fifth distance L6.
[0061] The twentieth distance L1 is less than the twenty-first
distance L2, and less than half of the twenty-second distance. The
twenty-third distance L4 is slightly greater than the twenty-fourth
distance L5. The twenty-fifth distance L6 is slightly greater than
half of the twenty-third distance L4. The sum of the sixth distance
D6, the tenth distance D10 and the twenty-third distance L4 is
equal to the total width. The sum of the sixteenth distance S2, the
second distance D2 and the twenty-first distance L2 is also equal
to the total width. The sum of the sixth distance D6, the
twenty-fifth distance L6, the eleventh distance D11 and the tenth
distance D10 is also equal to the total width.
[0062] The sixth distance D6 and the tenth distance D10 are less
than half of the twenty-third distance L4. The second distance D2
is slightly less than the twenty-first distance L2. The
twenty-first distance L2 is less than the sixteenth distance S2.
The sixth distance D6 is approximately equal to the tenth distance
D10, and greater than the twenty-fifth distance L6 or half of the
eleventh distance D11.
[0063] In addition, the design of the signal-feeding terminal 203
and the ground terminal 204 causes the antenna structure 200 to
have excellent operating efficiency in the LTE frequency band,
without changing the overall size.
[0064] Please refer to FIG. 3, which shows the relationship between
the frequency and the return loss of the antenna structure 200
according to one embodiment of the present invention. The vertical
axis of FIG. 3 represents the return loss (unit: dB), and the
horizontal axis represents the frequency (unit: MHz). As shown in
FIG. 3, with the operating frequencies having a return loss of -6
dB, it can be seen that the antenna structure 200 has good
impedance matching in the frequency band of 650-960 MHz.
[0065] Please refer to FIG. 4, which shows the relationship between
the frequency and the efficiency of the antenna structure according
to one embodiment of the present invention. The vertical axis of
FIG. 4 represents the efficiency (unit: %), and the horizontal axis
represents the frequency (unit: MHz). As shown in FIG. 4, the
efficiency of the antenna structure is up to 60% in the frequency
band of 698-960 MHz.
[0066] In conclusion, the present invention discloses a printed
dipole antenna structure which can be easily adjusted to achieve
many product applications. The bandwidth of the conventional PIFA
antenna is narrower, and so when it is applied, to a broadband
system, the structure is complex, and frequency band fine-tuning is
not easy to perform in different environments, in addition, if
multi-system sharing can be achieved without adjusting the
frequency band, the overall cost can be effectively reduced.
Therefore, it is easy for the printed dipole antenna structure in
the present invention to perform adjustments for the required
frequency bands in different environments. Furthermore, because the
printed dipole antenna structure in the present invention is
manufactured by directly printing the antenna structure onto a
printed circuit board, not only can the mold cost of the
three-dimensional antenna be reduced, but also the costs of
production and assembly also go down. Thus, the antenna structure
in the present invention meets the needs of today's electronics
industry which has the characteristic of low margins, can be used
in wireless network devices in various environments, and can be
easily applied to many different products. The idea behind the
present invention is to extend the current path of the ground
portion and the radiating path of the radiating portion in the same
direction. This causes the antenna structure to achieve efficiency
of nearly 60% in the region of the low-frequency LTE frequency
band. In addition, the antenna signal is fed by being directly
soldered to the signal-feeding terminal of the antenna with a
50.OMEGA.. Cable. The other end of the 50.OMEGA. Cable can be
arbitrarily extended to an RF signal module terminal so that the
antenna structure can be used with an independent printed circuit
board without being connected to additional systems, or
alternatively it can be used with a collocation of the system
ground. Therefore, the antenna structure in the present invention
also features an independent adjustment mechanism, which is
suitable for many different applications.
[0067] While the invention has been described, in terms of what is
presently considered to be the most practical and preferred
embodiments, it is to be understood that the invention needs not be
limited to the disclosed embodiments. On the contrary, it is
intended to cover various modifications and similar arrangements
included within the spirit and scope of the appended claims which
are to be accorded with the broadest interpretation so as to
encompass all such modifications and similar structures.
* * * * *